Self-sealing tire tube



June 17 1924.

H. H. ALLYN v SELF- ssALInG TIRE TUBE Filed Nov. 5, 1,923v

ATTORNEYS @secreted me l?, i924.,

STATES HARLEY H. ALLW, F PHILADELPHIA, PENNSYLVAA.

SLF-SEALING TIRE TUBE.

lApplication tiled November 5, 1928. Serial En.

To all whomlt may concern:

Be it known that l, HARLEY H. ALLYN, a citizen of the United States,residin at Philadelphia, county of Philadelphia, tate e of Penne lvania,have invented a new and useful Se f-Sealing Tire Tube, of which thefollowing is' a specification.

My present invention comprehends a novel construction of a self sealinginner tube for 1e automobile shoes or outer casings, whereby in case ofpuncture the opening made will be eectively closed and sealed when thenail or other device which causes the puncture is withdrawn,

It further comprehends a novel self sealing inner tube having two layersof vulcanized rubber between which is disposed a layer of rubber whichis unvulcanized or only partly vulcanized. The inner layer of nevulcanized rubber has on its inner face a layer of unvulcanized rubberwhich extends throu hout the tread portion and to a de sired eight ofthe sides.

ln my prior Patent No. 1,398,482, dated L Nov. 29, 1921, l havedescribed and claimed a self sealing inner tube of this type in whichthe inner layer of self sealing material, such as, for example,unvulcanized rubber, is covered with paper. lt has been found inpractice that` aper has disadvantages, namely, it is liab e to curl upso that the self sealing material and also the inner` layer ofvulcanized rubber overlaps it; the particles of the paper strip 0E andare 85 drawn into the opening of the puncture when the article whichcauses the puncture is withdrawn; and the self sealing material driesout. I have found after numerous experiments that if the inner layer` ofself el) sealin material is covered on its inner face with tm foil thatthe foregoing objections are eliminated.

My present invention thus comprehends a novel self sealin inner tubehaving an inner layer of self sea ing material which is covered on itsinner surface with tin foil.

@ther novel vfeatures of construction and advantage will hereinaftermore clearly appear in the detailed description and the apec pendedclaims.

For the purpose of illustrating my invention l have shown in the accomanying drawing a preferred embodiment o my invention which, in practice,will give satisfactory results.

manufacture.

Figure 1 is a transverse section of a conventional tire, in conjunctionwith which a self sealing inner tube embodying my invention is employed.

Figure 2 is a section on line 2 2 of Figure l.

Figure 3 is a transverse section of the self sealing inner tube.

Similar numerals of reference indicate corresponding` parts.

Referring to the drawings 1 desi y ates an outer shoe or tire casing ofany ddired or conventional type, and 2 designates a self sealing innertube embodying my invention. The tube 2 has a plurality of plies orlayers. 3 designates an outer layer of vulcanized rubber, and 4designates a similar inner layer of vulcanized rubber. Between these twolayers is disposed a ply or layer 5 of` selfsealing material such asunvulcanized or partly vulcanized rubber and which preferably is annularin cross section. The inner layer 4 has on its inner face throughout thetread portion and also preferably extending up the sides a layer 6 ofself sealing material, which is preferably a soft plastic composition.The inner face of this layer 6 is covered with tin foil 7. lf the tubeis punctured the tin foil does not strip ofi but breaks up into smallparticles, which, if drawn into the hole formed by the V4puncture, doesnot interfere with the sealing of the hole by the self sealing materialwhich is drawn through the hole by the withdrawal of the article whichcaused the puncture. This tin foil when initially applied adheresclosely to the self sealing material and does not curl up as does paperso that the juxtaposed layers do not lap over the tin foil during theprocess of The tin foil also has the advantage of retarding the dryingout of the self sealing material 6, 'with consequent deterioration inits selfsealing qualities.

It will now be apparent that l have described a novel and useful selfsealing inner tube which embodies the features of advantage set forth inthe statement of invention and the detailed description, and While Ihave, in the present instance, shown and described a preferredembodiment thereof which will give in practice satisfacto and reliableresults, it 1s to be understoo that this embodiment is susceptible ofmodica.- tion in various particulars, within the scope 110 of theappended claims, without departing from the spiritand scope of theinvention or sacrificing any of its advantages.

Having thus described my invention, what I claim-as new and desire tosecure by'Letters Patent is:

1. An inner tube having on its inner surface throughout its treadportion a layer of soft plastic composition with tin foil on its innersurface to prevent sticking and retard the drying of sald composition.

2. An lnner tube, having a plurality of:

layers of vulcanized material with a layer of sealing -material betweenthem, With a layer of non-vulanied sealing material on the inner face ofthe inner layer of vulcanized material throu hout the tread bearingportion, and with tm foil on the inner surface of said'layer ofnon-vulcanized sealing HARLEY H. ALLYN.'

. material. v

Witnesses H. S. FAnmANKs, M. FILBERG.

